218131031984 has 40 divisors (see below), whose sum is σ = 423731250000. Its totient is φ = 108781223936.

The previous prime is 218131031983. The next prime is 218131032013. The reversal of 218131031984 is 489130131812.

It is a super-2 number, since 2×218131031984² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218131031983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29084267 + ... + 29091765.

It is an arithmetic number, because the mean of its divisors is an integer number (10593281250).

Almost surely, 2^218131031984 is an apocalyptic number.

It is an amenable number.

218131031984 is a deficient number, since it is larger than the sum of its proper divisors (205600218016).

218131031984 is a wasteful number, since it uses less digits than its factorization.

218131031984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12005 (or 11999 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

Adding to 218131031984 its sum of digits (41), we get a square (218131032025 = 467045²).

The spelling of 218131031984 in words is "two hundred eighteen billion, one hundred thirty-one million, thirty-one thousand, nine hundred eighty-four".